The present invention is directed to a twin-row planter with tandem driven seed meters at a pair of row units at each row segment of a twin-row planter. A tandem drive system drives the seed meters in a tandem manner, which may include a single transmission assembly simultaneously rotating a pair of seed discs in the pair of seed meters at each row segment. An indexing system allows for quickly changing an amount of relative rotational or angular indexing of seed disks inside of the pair of seed meters at the pair of row units of each row segment to adjust longitudinal spacing between delivery locations of seeds from the seed disks at planted row segments of a planted twin-row. Adjustments can be made at disk hubs, between shaft segments linking the seed disks, or with multiple sets of mounting holds on the seed disks.
